a two stroke cycle said that two stroke of the piston to
complete firing cycle
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In a two-stroke engine, two strokes is one cycle. In a four
stroke engine, four strokes is one complete cycle. A stroke is a
part of a cycle. Remember that the "up" motion and the "down"
motion each count as one stroke.
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It is called the compression stroke.
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Pollution - 4 stroke has far less unburnt hydrocarbon in the
exhaust.
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Yes. A 2 cycle engine is also called a 2 stroke engine.